An oxide barrier between two metals across which electrons may be forced to tunnel. When immersed in liquid helium, a circuit containing such a junction is able to switch at very high speeds with low power dissipation. It thus avoids the heat-transfer problems that arise from silicon VLSI devices and is one way to attain superconductivity.
Articles on KurzweilAI.net that refer to Josephson JunctionThe Age of Intelligent Machines, Chapter 10: Visions By Ray Kurzweil
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